The initial stage of dam-break flow

Korobkin, Alexander A. ORCID: and Yilmaz, Oguz (2009) The initial stage of dam-break flow. Journal of Engineering Mathematics, 63 (2-4). pp. 293-308. ISSN 0022-0833

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The liquid flow and the free surface shape during the initial stage of dam breaking are investigated. The method of matched asymptotic expansions is used to derive the leading-order uniform solution of the classical dam-break problem. The asymptotic analysis is performed with respect to a small parameter which characterizes the short duration of the stage under consideration. The second-order outer solution is obtained in the main flow region. This solution is not valid in a small vicinity of the intersection point between the initially vertical free surface and the horizontal rigid bottom. The dimension of this vicinity is estimated with the help of a local analysis of the outer solution close to the intersection point. Stretched local coordinates are used in this vicinity to resolve the flow singularity and to derive the leading-order inner solution, which describes the formation of the jet flow along the bottom. It is shown that the inner solution is self-similar and the corresponding boundary-value problem can be reduced to the well-known Cauchy–Poisson problem for water waves generated by a given pressure distribution along the free surface. An analysis of the inner solution reveals the complex shape of the jet head, which would be difficult to simulate numerically. The asymptotic solution obtained is expected to be helpful in the analysis of developed gravity-driven flows.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Fluid and Solid Mechanics
Faculty of Science > Research Groups > Centre for Interdisciplinary Mathematical Research (former - to 2017)
Depositing User: Vishal Gautam
Date Deposited: 18 Mar 2011 10:24
Last Modified: 11 Jan 2023 11:35
DOI: 10.1007/s10665-008-9237-z

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